<template>
  <el-dialog width="500px" title="员工导入" :visible="showExcelDialog" @close="$emit('update:showExcelDialog', false)">
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <input ref="excel-upload-input" class="excel-upload-input" type="file" accept=".xlsx, .xls" @change="uploadChange">
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="getTemplate">下载导入模板</el-button>

          <span>将文件拖到此处或
            <el-button type="text" @click="handleUpload">点击上传</el-button>

          </span>

        </div>

      </div>

    </el-row>

    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>

    </el-row>

  </el-dialog>

</template>

<script>
import { getExportTemplate, uploadExcel } from '@/api/employee'
import FileSaver from 'file-saver'

export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    async getTemplate() {
      const data = await getExportTemplate()
      FileSaver.saveAs(data, '员工导入模板.xlsx')
    },
    async uploadChange(e) {
      // 1.获取上传的文件信息
      const files = e.target.files
      console.log('文件上传了', files)
      // 用户取消了上传的行为
      if (files.length === 0) return
      // 2，获取用户上传的文件
      // 3.生成一个formData对象
      const formData = new FormData()
      // 4.将文件添加到formData对象中
      formData.append('file', files[0])
      // 5.调用上传接口
      try {
        await uploadExcel(formData)
        this.$message.success('上传成功')
        this.$emit('uploadSuccess')
        this.$emit('update:showExcelDialog', false)
      } finally {
        // 清空文件选择器的值
        this.$refs['excel-upload-input'].value = ''
      }
    },
    handleUpload() {
      this.$refs['excel-upload-input'].click() // this.$refs.属性名 和 this.$refs[属性名] 等价
    }
  }

}
</script>

<style scoped lang="scss">
.upload-excel {
  display: flex;
  justify-content: center;
  margin: 20px;
  width: 360px;
  height: 180px;
  align-items: center;
  color: #697086;

  .excel-upload-input {
    display: none;
    z-index: -9999;
  }

  .btn-upload,
  .drop {
    border: 1px dashed #dcdfe6;
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 160px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .drop {
    line-height: 40px;
    color: #bbb;

    i {
      font-size: 60px;
      display: block;
      color: #c0c4cc;
    }
  }
}
</style>
